How to Recognize - and Prevent - Hazard TreesTree City USA Bulletin #15—Sources for More InformationSome excellent publications are available that expand on the material presented in Bulletin No. 15. Here are two books that we recommend: A Photographic Guide to the Evaluation of Hazard Trees in Urban Areasby Nelda P. Matheny and James R. Clark.This is a very thorough treatment of a very important topic. This 72-page book is well illustrated and presented in a style that is easy to understand. Evaluation methods and forms are included, and a description of structural failure histories for over 100 species and cultivars. Available from:
Tree Risk Management
by E. Thomas Smiley, Bruce R. Fraedrich and Neil Hendrickson.50-pages and illustrated. This 'how-to' publication includes the results of research that can be used in helping to decide if decaying trees are still safe, or more likely to fail. Available from:
Leaflets
Probably no other single individual has done as much research and public education about understanding tree decay and hazards as the late Dr. Alex Shigo, former chief scientist and project leader with the USDA Forest Service. His various publications and other materials are now available online. Of particular interest here is his leaflet, Tree Hazards - 13 Questions That Could Save a Life. For more information, please visit:
WorkshopsThe Arbor Day Foundation sponsors workshops throughout the year on evaluating trees for hazard. For upcoming events, please visit 'Conferences and Seminars' found elsewhere in the pages of this Web site. More Information
Call: 402-474-5655 Tree City USA is supported by the USDA Forest Service Urban and Community Forestry Program. 
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